High Serverload after Update

Hi Volks,
does beside of me somebody else has that problem?
I use for ~6 WordPress Installs a Dedicated Server Solution from Hostgator and i never had problems with it. They were up and running fine.
Yesterday i made the Update from 3.5 to 3.5.1 because i do normally keep everything up to date.

But here i get now an extreme high server load. It seems to have started ~5-6 hours after i made the updates. Somehow on the server are now lots of processes started what can’t be ended the right way and get stuck.
I don’t know if you guy tells this something: Load Averages: 19.28 35.18 38.12 with peaks up to 50.XX <– These Values before were more like Load Averages: 0.28 0.18 0.12 — So really small, because there were never THAT much traffic on the sites.

Hostgator told me that it wouldn’t be a server misconfiguration, bad for me, i have to believe them, because i know nearly nothing about it.

Maybe someone else has an idea how to fix that, because at the moment the Websites are nearly unable to reach.

Kind regards